import { Injectable, Injector, Inject } from '@angular/core';
import { Router } from '@angular/router';
import { HttpClient } from '@angular/common/http';
import { zip } from 'rxjs/observable/zip';
import { catchError } from 'rxjs/operators';
import { MenuService, SettingsService, TitleService, ALAIN_I18N_TOKEN } from '@delon/theme';
import { DA_SERVICE_TOKEN, ITokenService } from '@delon/auth';
import { ACLService } from '@delon/acl';

/**
 * 用于应用启动时
 * 一般用来获取应用所需要的基础数据等
 */
@Injectable()
export class StartupService {
    constructor(
        private menuService: MenuService,
        private settingService: SettingsService,
        private aclService: ACLService,
        private titleService: TitleService,
        @Inject(DA_SERVICE_TOKEN) private tokenService: ITokenService,
        private httpClient: HttpClient,
        private injector: Injector) { }

    private viaHttp(resolve: any, reject: any) {
        zip(
            this.httpClient.get('assets/app-data.json')
        ).pipe(
            // 接收其他拦截器后产生的异常消息
            catchError(([appData]) => {
                resolve(null);
                return [appData];
            })
        ).subscribe(([appData]) => {

            // application data
            const res: any = appData;
            // 应用信息：包括站点名、描述、年份
            // this.settingService.setApp(res.app);
            // 用户信息：包括姓名、头像、邮箱地址
            this.settingService.setUser(res.user);
            // ACL：设置权限为全量
            this.aclService.setFull(true);
            // 初始化菜单
            this.menuService.add(res.menu);
            // 设置页面标题的后缀
            this.titleService.suffix = res.app.name;
        },
            () => { },
            () => {
                resolve(null);
            });
    }

    load(): Promise<any> {
        // only works with promises
        // https://github.com/angular/angular/issues/15088
        return new Promise((resolve, reject) => {
            // http
            // this.viaHttp(resolve, reject);
            // mock：请勿在生产环境中这么使用，viaMock 单纯只是为了模拟一些数据使脚手架一开始能正常运行
            this.viaHttp(resolve, reject);
        });
    }
}
